Improvement in valves for engines



s.KH. EvlNs el 1. wEl's. Valves for Engines.

" Ilmqnie'd sept. 22;1a74

Maf m UNITED STATES PATENT OFFICE.

SETH H. BEVINS .AND JOSEPH WEIS, JERSEY OITY,NEW JERSEY.

IMPROVEMENT IN VALVES FOR ENGINES.

vSpecification forming part of Letters Patent No. 155,217, dated September 22, 1874; application filed June 9, 1874.

To all whom it may concern:

Be it known that we, SETE H. BEvINs and JOSEPH WEIS, of Jersey City, in the county of Hudson and State of New Jersey, have invented an Improvement in Valves for Steam- Engines, of which the following is a specification:

Engines have been made in which. a sliding plate having ports in ithas been employed between the cylinder and the seat of the slidevalve, so that by moving this slide-plate the connections ofthe ports will be so changed as to reverse the engine Without changing the connections to the ordinary slidevalve of the engine.

Our invention relates to an arrangement of steam and exhaust ports with the single slidevalve and sliding plate, that the sliding plate intervenes between the cylinder and the exhaust-ports. Thereby the engine-valve and its ports remain of the usual character, and the slide intervening simply directs the exhaust and the steam to the ordinary ports of the cylinder, or to ports that cross each other, so that the steam admitted by the valve passes either to the end of the cylinder corresponding to that port, or to the opposite end of the cylinder, according to the position of the intermediate port-plate. We also employ keys to compensate wear, and prevent steam passing the port-plate from the steam to the exhaust ports.

In the drawing, Figure l is a section of the engines and valves in the plane of the piston and valve-rods, and Fig. 2 is a section transversely of the same.

The cylinder a, piston b, valve-rod c, valve d, steam chest e, steam and exhaust ports l and 2 in the valve seat e, are of ordinary character, and we have shown the engine as double, and especially adapted to use with elevators for buildings; and the port-plates hereafter described are operated by a connection of the character usual with such elevators, so that the elevator can be lifted, stopped, or lowered by reversing the engine by moving the said port-plate, or the steam and exhaust both cut o by moving` the plate to an intermediate position. The exhaust-pipe from f is, by preference, united, as seen in Fig. 2, in one common exit-pipe, f. The ports 1 l are widened as they approach the port-plate h, and terminate in line With the ports 5 5, that pass direct to the ends of the cylinder a, and in line with the ports 6 and 7, that cross each other, and emerge in the cylinder at the correspondingly-numbered openings. The portplate h has the ports 9 l0 11, and the stem l serves to move such' plate endwise; and when the engines are double, as represented, the said ports 9 10 11 should be in reverse positions, so that both engines will be simultaneously operated by moving the walking-beam m by the band-wheel a, either one way or the other, by the stopping and starting ropeor chain of the elevator. The stems Zand portplates might, however, be operated by levers in any convenient manner. The keys o r s (seen in detached plan'view) are introduced between the port-plate h and the stationary portion of the exhaust, and these keys are beveled on the edges and slightly tapering in their length, and the center key can be pressed endwise by the screw h', so as to tighten up the keys and compensate Wear.

By reference to the ports, as shown in Fig. l, it Vwill be seen that the engine is working in the ordinary manner, the steam passing by the ports l, 9, and 5, and the exhaust leaving by the ports 5, 11, and 1, the slide valve d only opening the steam and exhausts alternately, as the stroke of the engine terminates.

When the port-plate h is moved into the intermediate position shown in Fig. 3, the steam and exhaust ports are all closed; hence the engine will be stopped.

When the port-plate his moved to the po sition shown in Fig. 4, the openings to the ports 5 5 are closed, and those to the ports 6 and 7 are opened, and these crossing'each other, as before described, the action of the engine will be reversed in consequence of steam passing into the end of the cylinder,

to which the exhaust Would be opened by the stationary portion f of the valve-chest, and

usual connections and the reverse. adjusted es and for the purposes set forth.

We claim as our invention- Signed by us this 22d day of April, A. D. l. The plate 71 With ports 9 10 ll inter- 1874. .v

posed between the stationary exhaust f and the engine, in oombination with the ports l l 2 5 5 and crossing port-s 6 and 7 and the slide-valve d, substantially as set forth. Witnesses:

2. The tapering and inclined keys o r s, in i GEO. T. PINCKNEY,

combination With the port-plate h and the CEAS. H. SMITH.

SETH H. BEVINS. JOSEPH WEIS. 

